I would run the AWSF32C in GT-40 heads. The other option is to run the Autolite 104 or 764 which are both a direct cross for the AWSF32C. If the car sees 90% stop and go traffic driving, then you could run the 42C's, but otherwise I'd go with the 32C.
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Jeff Chambers
Trophy Stock #3
11.86 Seconds / 113.8 MPH
Chambers Racing Team